Vance is nearly as much of a fraud and conman as Chump (you can research his history).
You can also check his previous comments re Chump (Publicly, he called the Republican businessman an "idiot" and said he was "reprehensible." Privately, he compared him to Adolf Hitler.). . . .source Reuters, though many other fact-check sites will confirm just that and more.
Then, at some point during or soon after Chump's first term, Vance was apparently shopping in a store labelled 'Political expediency & hypocrisy' and had a biblical style revelation, that Chump could likely win a further term (with a lack of charismatic candidates in both parties). Hence his dramatic conversion to Chump's beliefs and 'policies', and his sudden elevation, from being relatively unknown, to an odious and insulting VP.
So, for Oreo, and GrannyGravy and others, Vance was referring to Hitler well before anyone on these threads (& for all Chump's many faults, he hasn't instigated a comprehensive set of Holocaust death camps, nor caused some 30+ million deaths of combatants and civilians).